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Phase-Shift를 이용한 시분할형 부하병렬 고주파 인버터의 특성해석에 관한 연구
조규판,원재선,김동희,노채균,원규식,심광열 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.2
A half bridge time sharing type load parallel high frequency resonant inverter to give VVVF function in the inverter used as power source of induction heating at high frequency is presented in this paper. This proposed inverter can reduce distribution of the switching current because of using the current of serial resonant circuit to the input current of the parallel one and this paper also realize the output control of independence irrespective of the switching frequency using Phase-Shift. The analysis of the proposed circuit is generally described by using the normalized parameters. Also, the principle of basic operation and the its characteristics are estimated by the parameters, such as switching frequency, the variation of phase angle(φ) of Phase-Shift. It is certain that the proposed circuit will be used and expanded in the high frequency power supplies like induction heating systems.
CAD/CAM 으로 제작된 Ceramic Inlay의 변연누출에 관한 비교연구
조병훈,이명종,임미경,이광원,손호현 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2
To compare the marginal leakage of CAD/CAM-fabricated ceramic inlay, gold inlay and amalgam, forty extracted caries-free premolars were prepared with Class Ⅱ MO cavity design. The teeth were divided into four groups of ten samples each. Group 1 was restored with CAD/CAM-fabricated ceramic inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 2 was restored with gold inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 3 was restored with gold inlays cemented with zinc phosphate cement. And, Group 4 was restored with amalgam. All samples were thermocycled, and stored in 1% methylene blue. Marginal leakage was examined at four margins, that is, occlusal distal, priximal gingival, occlsal facial and occlusal lingual margins from sectioned samples under steeomicroscope(x15). The results were as follows: 1. Group 1 and 2 showed no statistically significant difference among marginal leakage at all four examined margins(p>0.05). 2. Group 3 and 4 showed significant marginal leakage at proximal gingival margin compared with other margins(p<0.05). 3. Significantly increased marginal leakage at priximal gingival, occlusal facial and occlusal lingual margins in group 3 were observed compared with other groups(p<0.05).
조정식,이광래,유동석,강석원 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-
석회유의 탄산화반응에 의하여 생성되는 탄산칼슘의 결정화공정에 대한 정량적 해석을 위하여 개체군 수지식(population balance)을 이산화(discretization)하는 방법에 의해 반회분식 침전결정화기에서 생성된 탄산칼슘의 입도분포를 수치모사하여 실험치와 비교하였다. 수치모사에 의한 탄산칼슘의 입도분포는 실험치와 잘 일치하였으며, 응집이 입자크기에 의존(size-dependent agglomeration)한다고 가정한 경우가 응집이 입자크기와는 무관(size-independent agglomeration)하다고 가정한 경우보다 실험치에 더 근사한 결과를 보였다. 또한, 응집핵(agglomeration kernel)이 깨어짐핵(rupture kernel)보다 입도분포에 미치는 영향이 더 큰 것을 알 수 있었다. For the quantitative analysis of crystallization of calcium carbonate formed by carbonation of lime milk, PSD(particle size distribution) of the calcium carbonate, which is the carbonation product of lime milk, was numerically simulated by the method of discretization of population balance and compared with the experimental data of semi-batch precipitative crystallizer. The simulated PSD was well correlated with the experimental data. And the simulated results of PSD for size-dependent agglomeration were well-matched to the experimental data than for the size-independent agglomeration. Moreover, it was shown that agglomeration kernel had greater effects on PSD than rupture kernel.
소각로 배출원별 입경분포 및 이온성분과 방지시설효능에 관한 연구
조상원,정종현,김봉기,오광중 부산대학교 환경문제연구소 1995 環境硏究報 Vol.13 No.-
This study was to comprehend the effect by investigating the particulate size and ingredient, examining the each process size distribution and analyzing all kinds of the ions in incinerator. Incinerating the wood in the absence of control devices, the peaks appeared in coarse particle and it had trimodal distribution. Also in the presence of control devices, the best efficiency appeared in fine particel. Cl?? and SO₄², were mostly distributed in fine particle area and in coarse particle area respectively. In the case of synthetic resin incineration, the size distribution had the peak at both 0.865㎛ and 4.2㎛. In the presence of control devices, peak appeared at 5.95㎛ and the collection efficiencies of Cl??, SO₄², Ca², Na??, K?? were high. Incinerating the leather without control devices, the size distribution had the peak at both 2.58㎛ and 5.95㎛. The leather incineraton had the same collection efficiency as sythetic resin incineration. The coarse particle collection efficiency was high. It is adquate to use the above control devices, together with high efficiency collector like bagfilter. To select the adequate control devices, it is required to investigate the size distribution before establishing control devices.
조원모,기광석,정하연,강수원,김준식,오성종,김용국 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.2
본 연구는 한우 육성우에 대한 황토 첨가급여가 항병성에 미치는 효과를 구명하고자 혈액성상변화를 규명한바 아래와 같은 결과를 얻었다. 대조구 및 처리구에서 전체적인 혈액성상의 변화는 없었으나 백혈구수치가 대조구 및 처리구에서 각각 15.35K/㎕ 및 13.37K/㎕이였으며, 적혈구에 있어서도 정상수치인 5~10M/㎕보다 대조구 10.03M/㎕, 처리구 11.35M/㎕로 모두 높은 수치를 보였다. 황토첨가에 따른 혈액성상의 변화는 처리간에 유의한 차이는 보이지 않았다. The study was conducted to investigate the effect of dietary supplements of reddish clay on the immunity of growing Hanwoo steers. A total of 8 calves were divided into 2 feeding groups, control(basal diet) and treatment(basal diet plus ad libitu reddish clay) for Hanwoo steers. This study was carried out for 5 months using 8 calves. The results obtained by the present study are summarized as follows : The proportion of WBC, NE as well as LY(15.35, 6.85, 6.86K/??) was higher in the control group than in the Reddish clay-supplemented group. But no statistical differences were found in blood substances among treatment calves.
태양광 발전전력을 입력으로한 DC/DC 컨버터의 일정출력제어
조용길,허태원,신동률,조광승,우정인 東亞大學校 大學院 2000 大學院論文集 Vol.25 No.-
In this paper, it is proposed to constant power control of solar power system. The solar power system has disadvantage that low power density and variable power output. Proposed strategy is controled by DC/DC converter using phase shift PWM and I-PD type control applying type 1 digital system. The validity of proposed control strategy is verified from simulations results using PSIM.
조원모,기광석,정하연,강수원,김준식,백봉현,김용국 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.1
본 연구는 거세한우 육성우에 대한 황토 첨가급여가 발육에 미치는 효과를 구명하고자 발육능력, 사료섭취량을 규명한 바 아래와 같은 결과를 얻었다. 전 시험기간 동안의 평균 일당증체량은 대조구와 황토급여구가 각각 0.91㎏과 0.87㎏/day로 대조구가 높은 것으로 나타났지만 유의성은 인정되지 않았다. 사료섭취량은 대조구와 황토급여구 모두 평균 일일 두당 농후사료 섭취량이 2.42㎏이었으나, 건초섭취량에 있어서는 각각 3.02와 3.14㎏으로 황토급여구가 다소 높은 경향으로 나타났다. The study was conducted to investigate the effect of dietary supplements of reddish clay on the growth performance in growing Hanwoo steers. A total of 8 calves was allocated into 2 feeding groups, control(basal diet) and treatment(basal diet plus ad libitim Reddish clay) for Hanwoo steers. This study was carried out for 5 months with a total of 8 calves. The results obtained in the present studies are summarized as follows : Average daily gains throughout the experimental period of 4 months to 9 months of age were 0.91 and 0.87㎏ for control group and reddish clay-supplemented group, respectively, however, no statistical significances were found. Average daily intake of concentrates was 2.42㎏ for each group, while that of hay tended to be higher in reddish clay-supplemented group(3.14㎏) than in control group(3.02㎏).
외상환자의 중증도분류를 위한 Triage Score와 Triage-Revised Trauma Score의 비교
조광원,황성연,배성만 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3
Background: The triage-revised trauma score(t-RTS) is used for triage in trauma patients in many countries. Recently, the triage score was developed as a new triage method for trauma patients in Korea. The objective of this study was to assess the accuracy of triage for the t-RTS and the triage score. Methods: The medical records of 1575 consecutive trauma patients visiting the Emergency Center, Masan Samsung Hospital, from March to August 1999 were retrospectively analyzed. The triage score and the t-RTS were taken from the charts completed by the emrgency room doctors and nurses. The accuracies of the two triage methods were compared by using the undertriage and the overtriage rates, receiver operating characteristic(ROC) curve analysis, and a correlation analysis with many physiologic, anatomical, biochemical, and mixed scores(Glasgow coma scale, injury severity score, TRISS, APACHE II and III scores, operation, survival, etc.). Results: The undertriage rates for the triage score and the t-RTS were 22.8% and 38.2%, respectively(p≤0.001), the overtriage rates were 6.3% and 3.1%, respectively,(p≤0.001), and the accurate triage rates were 91.3% and 91.7%, respectively. The areas under ROC curves for the triage score and the t-RTS were 0.871±0.033 and 0.800±0.039, respectively(95% confidence interval, p<0.001). In general, the correlations of the two triage methods with many physiologic, anatomical, biochemical, and mixed scores were moderately high, but there were no statistical differences between the correlation coefficients of the two triage methods for those scores. Conclusion: The triage score was equal or superior to the t-RTS for triage in trauma patients. The former was simpler and could be used easily by emergency medical personnel. Therefore, the authors conclude that the triage score can be used instead of the t-RTS for triage in trauma patients.
정형환,주수원,이광우 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2
This model is built up according to the ecologic relationships between different epidemiological types of individuals. A Markovian process is associated to the epidemic control process with a finite number of states and a discrete time. {Y_(t), t≥0} The quantitative aspect of the model was characterized by digital computer simulation.
조광수,김경용,이원복,김동창 중앙대학교 의과대학 의과학연구소 1990 中央醫大誌 Vol.15 No.2
The patterns of 5 tributaries draining into the great saphenous vein were stuided in 33 cases of Korean adult female cadavers from 20 to 88 years of age (average age, 64). 1. Each tributaries emptied separately into the great saphenous vein in 12.1% (left: 7.6%, right:4.5%) 2. The superficial epigastric vein and the superficial circumflex iliac vein joined to form a single trunk draining into the great saphenous vein in 18.2%. The incidences were equal in the both sides. 3. The lateral accessary saphenous vein and the superficial circumflex iliac vein joined to form a single trunk draining into the great sapheous vein in 12.1% (left: 7.6%, right: 4.5%). 4. The superficial external pudendal vein and the superficial epigastric vein joined to form a single trunk draining into the great saphenous vein in 1,5% (only in right side). 5. The superficial external pudendal vein and the medial accessory saphenous vein joined to form a single trunk draining into the great saphenous vein in 9.1% (left: 3.0%, right: 6.1%). 6. The superficial circumflex iliac vein, the superficial epigastric vein and the lateral accessary saphenous vein joined to form a single trunk draining into the great saphenous vein in 25.8% (left: 12.1%, right: 13.7%). 7. The dual fusion took place, namely the superficial external pudendal vein with the superficial epigastric vein and the superficial circumflex iliac vein with the lateral accessory saphenous vein to drain separately into the great saphenous vein in 3.0% (only in left side). 8. The dual fusion was shown between the superficial external pudendal vein and the medial accessory saphenous vein and between the superficial circumflex iliac vein and the lateral accessory saphenous vein draining separately into the great saphenous vein in 4.6% (left: 3.1%, right:1.5%) 9. The superficial epigastric vein, the superficial external pudendal vein and the medial accessory saphenous vein joined to form a single trunk draining into the great saphenous vein in 3.0% (only in right side). 10. The dual fusion took place between the superficial external pudendal vein and the medial accessory saphenous vein and between the superficial circumflex iliac vein, the superficial extenal pudendal vein and the superficial epigastric vein, and was draining separately into the great saphenous vein in 1.5% (only in left side). 11. The incidence which showed the cases deficient in one or more tributaries was 9.1%.